import React, { useState, useEffect,useContext } from 'react';
import Horizen from '../../baseUI/horizen-item';
import { renderRoutes } from 'react-router-config';
import { categoryTypes, alphaTypes } from '../../api/config';
import  LazyLoad, {forceCheck} from 'react-lazyload';
import {
  NavContainer,
  ListContainer,
  List,
  ListItem
} from "./style";
import { connect } from 'react-redux';
import {
  getSingerList,
  getHotSingerList,
  changeEnterLoading,
  changePageCount,
  refreshMoreSingerList,
  changePullUpLoading,
  changePullDownLoading,
  refreshMoreHotSingerList
} from './store/actionCreators';
import {CHANGE_CATEGORY,CHANGE_ALPHA,CategoryDataContext} from './data';
import Scroll from '../../baseUI/scroll/index';
function Singers(props) {
  // let [category, setCategory] = useState('');
  // let [alpha, setAlpha] = useState('');

  const {data, dispatch} = useContext (CategoryDataContext);
  const {category, alpha} = data.toJS ();
  const { singerList, enterLoading, pullUpLoading, pullDownLoading, pageCount } = props;
  const { getHotSingerDispatch, updateDispatch, pullDownRefreshDispatch, pullUpRefreshDispatch } = props;

  useEffect (() => {
    if (!singerList.size) {
      getHotSingerDispatch ();
    }
  }, []);
  const handlePullUp = () => {
    pullUpRefreshDispatch(category, alpha, category === '', pageCount);
  };

  const handlePullDown = () => {
    pullDownRefreshDispatch(category, alpha);
  };
  // let handleUpdateAlpha = (val) => {
  //   setAlpha(val);
  //   updateDispatch(category, val);
  // };
  // let handleUpdateCatetory = (val) => {
  //   setCategory(val);
  //   updateDispatch(val, alpha);
  // };
  let handleUpdateAlpha = (val) => {
    dispatch ({type: CHANGE_ALPHA, data: val});
    updateDispatch (category, val);
  };
  
  let handleUpdateCatetory = (val) => {
    dispatch ({type: CHANGE_CATEGORY, data: val});
    updateDispatch (val, alpha);
  };
  const enterDetail = (id)  => {
    props.history.push (`/singers/${id}`);
  };

  //mock 数据
  // const singerList = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12].map(item => {
  //   return {
  //     picUrl: "https://p2.music.126.net/uTwOm8AEFFX_BYHvfvFcmQ==/109951164232057952.jpg",
  //     name: "隔壁老樊",
  //     accountId: 277313426,
  //   }
  // });

  // 渲染函数，返回歌手列表
  const renderSingerList = () => {

    const list = singerList ? singerList.toJS() : [];
    return (
      <List>
        {
          list.map((item, index) => {
            return (
              <ListItem key={item.accountId + "" + index} onClick={() => enterDetail(item.id)}>
                <div className="img_wrapper">
                <LazyLoad placeholder={<img width="100%" height="100%" src={require ('./singer.png')} alt="music"/>}>
                  <img src={`${item.img1v1Url}?param=300x300`} width="100%" height="100%" alt="music" />
                </LazyLoad>
                </div>
                <span className="name">{item.name}</span>
              </ListItem>
            )
          })
        }
      </List>
    )
  };
  return (
    <div>
      <NavContainer>
        <Horizen
          list={categoryTypes}
          title={"分类 (默认热门):"}
          handleClick={handleUpdateCatetory}
          oldVal={category}></Horizen>
        <Horizen
          list={alphaTypes}
          title={"首字母:"}
          handleClick={val => handleUpdateAlpha(val)}
          oldVal={alpha}></Horizen>
      </NavContainer>
      <ListContainer>
        <Scroll
          onScroll={forceCheck}
          pullUp={handlePullUp}
          pullDown={handlePullDown}
          pullUpLoading={pullUpLoading}
          pullDownLoading={pullDownLoading}>
          {renderSingerList()}
        </Scroll>
      </ListContainer>
      { renderRoutes (props.route.routes) }
    </div>
  )
}
const mapStateToProps = (state) => ({
  singerList: state.getIn(['singers', 'singerList']),
  enterLoading: state.getIn(['singers', 'enterLoading']),
  pullUpLoading: state.getIn(['singers', 'pullUpLoading']),
  pullDownLoading: state.getIn(['singers', 'pullDownLoading']),
  pageCount: state.getIn(['singers', 'pageCount'])
});
const mapDispatchToProps = (dispatch) => {
  return {
    getHotSingerDispatch() {
      dispatch(getHotSingerList());
    },
    updateDispatch(category, alpha) {
      dispatch(changePageCount(0));//由于改变了分类，所以pageCount清零
      dispatch(changeEnterLoading(true));//loading，现在实现控制逻辑，效果实现放到下一节，后面的loading同理
      dispatch(getSingerList(category, alpha));
    },
    // 滑到最底部刷新部分的处理
    pullUpRefreshDispatch(category, alpha, hot, count) {
      dispatch(changePullUpLoading(true));
      dispatch(changePageCount(count + 1));
      if (hot) {
        dispatch(refreshMoreHotSingerList());
      } else {
        dispatch(refreshMoreSingerList(category, alpha));
      }
    },
    //顶部下拉刷新
    pullDownRefreshDispatch(category, alpha) {
      dispatch(changePullDownLoading(true));
      dispatch(changePageCount(0));//属于重新获取数据
      if (category === '' && alpha === '') {
        dispatch(getHotSingerList());
      } else {
        dispatch(getSingerList(category, alpha));
      }
    }
  }
};
export default connect(mapStateToProps, mapDispatchToProps)(React.memo(Singers));